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- Improper fastening
- Exposure to high winds
- Replace shingles which have completely blown off. For shingles with tabs blowing
up and down, hand seal the shingles with an asphalt plastic cement, commonly referred to
as flashing cement. This roofing cement must comply with ASTM D4586--Type I or Type II
which is the standard specifically for asbestos-free asphalt plastic roof cement.
- To hand seal, lift each tab of a 3-tab shingle and apply two spots of the cement
under each tab. Each spot should be approximately the size of a quarter and placed
1" to 2" from each end of the tab and near the bottom. Laminated shingles require 4
spots of cement per shingle. After application, press the tab down firmly to start
the bond. Be careful not to apply the cement too close to the bottom of the tab.
This causes the cement to squeeze out when the tab is pressed down.